#!/bin/ksh
hour=0
until (( hour > 23 ))
do
	case "$hour" in
	[0-9]|1[0-1]) print "Good morning!"
			;;
	12) print "Lunch time"
			;;
	1[3-7]) print "Siesta time"
			;;
	*) print "Good night"
			;;
	esac
	(( hour+=1 ))
done
